Worked on enhancing the EL3-RMM IDE KM Interface documentation within the zephyrproject-rtos/trusted-firmware-a repository, focusing on improving clarity and accuracy for developers integrating with this interface. Applied structured technical writing and API documentation best practices using reStructuredText (RST), correcting errors, refining formatting, and clarifying input and output values for key programming and key set operations. Updated descriptions of failure conditions to support more effective troubleshooting and reduce misinterpretation. These documentation improvements established a clearer onboarding path and reduced potential integration issues, ultimately lowering support overhead for downstream teams working with the EL3-RMM interface in trusted firmware environments.